Finding the Fourth Proportional to 72,386.79, 108,430.73 and 53,687.94

Step by Step Solution

1. Step 1: Write the proportion equation
   72,386.79 : 108,430.73 = 53,687.94 : x
2. Step 2: Convert to fraction form
   72,386.79/108,430.73 = 53,687.94/x
3. Step 3: Cross multiply
   72,386.79x = 108,430.73 × 53,687.94
4. Step 4: Simplify right side
   72,386.79x = 5,821,422,526.40
5. Step 5: Solve for x
   x = 5,821,422,526.40/72,386.79
6. Step 6: Final answer
   x = 80,421.06